It depends how much you want to work on the map.
Currently if you loose there is no game_end entity to change the level and no way of restarting the game without reloading the map. The game_end I can live without as most inteligent server ops have decent voting systems. So my only issue is that it would be nice to have the ability to restart the game once the game is lost or won.
If you did want to work more perhaps the ability for atleast 4 and maybe 8 max players. You could have some system that counts the players playing and increase the scroll speed accordingly.
Or going on what blues said Red vs Blue (Though I much prefer how you have it now in its glorious classic form

).
So besides the restart thing, I love it.